core/desktopentry: watch for changes and rescan entries

src/core/desktopentrymonitor.hpp

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <qfilesystemwatcher.h>
+#include <qobject.h>
+#include <qstringlist.h>
+#include <qtimer.h>
+
+class DesktopEntryMonitor: public QObject {
+	Q_OBJECT
+
+public:
+	explicit DesktopEntryMonitor(QObject* parent = nullptr);
+	~DesktopEntryMonitor() override = default;
+	DesktopEntryMonitor(const DesktopEntryMonitor&) = delete;
+	DesktopEntryMonitor& operator=(const DesktopEntryMonitor&) = delete;
+	DesktopEntryMonitor(DesktopEntryMonitor&&) = delete;
+	DesktopEntryMonitor& operator=(DesktopEntryMonitor&&) = delete;
+
+signals:
+	void desktopEntriesChanged();
+
+private slots:
+	void onDirectoryChanged(const QString& path);
+	void processChanges();
+
+private:
+	void startMonitoring();
+	void scanAndWatch(const QString& dirPath);
+
+	QFileSystemWatcher watcher;
+	QTimer debounceTimer;
+};